"TUNA" is slang for an over-abundance of straight girls that for one reason or another invade gay bars. The slang is mostly used my gay/bi guys that are annoyed that these creatures choose to gather in crowds at these establishments when there are plenty of straight bars for them to swim around in.

Tuna is a term used to classify teen girls. These girls are considered sluts, whores, and of course bitches. They preform activity such as preforming oral sex or cheating with best friends boyfriends. One of this nature can not be trusted. Any of which that partake in these ruthless group will soon inherited a bad repetition as the towns/schools/cities tramp. Tuna also has a tale of smelling like of course...tuna. Guys that are willing to risk it all and "hook up" will have to suffer with the pain of smelling like week old fish. It is not recommended to go any where near 100 feet of this dangerous character.

Girl 1: See that girl?
Girl 2: Yah...why?
Girl 1: I heard what she did this weekend. She is a real tuna.
Girl 2: Eww...